Add GitHub Actions MCP server for viewing workflow results (#231)

* actions server

* tmp

* Replace view_actions_results with additional_permissions input

- Changed input from boolean view_actions_results to a more flexible additional_permissions format
- Uses newline-separated colon format similar to claude_env (e.g., "actions: read")
- Maintains permission checking to warn users when their token lacks required permissions
- Updated all tests to use the new format

This allows for future extensibility while currently supporting only "actions: read" permission.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Update GitHub Actions MCP server with RUNNER_TEMP and status filtering

- Use RUNNER_TEMP environment variable for log storage directory (defaults to /tmp)
- Add status parameter to get_ci_status tool to filter workflow runs
- Supported statuses: completed, action_required, cancelled, failure, neutral, skipped, stale, success, timed_out, in_progress, queued, requested, waiting, pending
- Pass RUNNER_TEMP from install-mcp-server.ts to the MCP server environment

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Add GitHub Actions MCP tools to allowed tools when actions:read is granted

- Automatically include github_ci MCP server tools in allowed tools list when actions:read permission is granted
- Added mcp__github_ci__get_ci_status, mcp__github_ci__get_workflow_run_details, mcp__github_ci__download_job_log
- Simplified permission checking to avoid duplicate parsing logic
- Added tests for the new functionality

This ensures Claude can use the Actions tools when the server is enabled.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Refactor additional permissions parsing to parseGitHubContext

- Moved additional permissions parsing from individual functions to centralized parseGitHubContext
- Added parseAdditionalPermissions function to handle newline-separated colon format
- Removed redundant additionalPermissions parameter from prepareMcpConfig
- Updated tests to use permissions from context instead of passing as parameter
- Added comprehensive tests for parseAdditionalPermissions function

This centralizes all input parsing logic in one place for better maintainability.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Remove unnecessary hasActionsReadPermission parameter from createPrompt

- Removed hasActionsReadPermission parameter since createPrompt has access to context
- Calculate hasActionsReadPermission directly from context.inputs.additionalPermissions inside createPrompt
- Simplified prepare.ts by removing intermediate permission check

This completes the refactoring to centralize all permission handling through the context object.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* docs: Add documentation for additional_permissions feature

- Document the new additional_permissions input that replaces view_actions_results
- Add dedicated section explaining CI/CD integration with actions:read permission
- Include example workflow showing how to grant GitHub token permissions
- Update main workflow example to show optional additional_permissions usage

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* roadmap

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/create-prompt/index.ts

@@ -36,9 +36,21 @@ const BASE_ALLOWED_TOOLS = [
 ];
 const DISALLOWED_TOOLS = ["WebSearch", "WebFetch"];
 
-export function buildAllowedToolsString(customAllowedTools?: string[]): string {
+export function buildAllowedToolsString(
+  customAllowedTools?: string[],
+  includeActionsTools: boolean = false,
+): string {
   let baseTools = [...BASE_ALLOWED_TOOLS];
 
+  // Add GitHub Actions MCP tools if enabled
+  if (includeActionsTools) {
+    baseTools.push(
+      "mcp__github_ci__get_ci_status",
+      "mcp__github_ci__get_workflow_run_details",
+      "mcp__github_ci__download_job_log",
+    );
+  }
+
   let allAllowedTools = baseTools.join(",");
   if (customAllowedTools && customAllowedTools.length > 0) {
     allAllowedTools = `${allAllowedTools},${customAllowedTools.join(",")}`;
@@ -665,8 +677,12 @@ export async function createPrompt(
     );
 
     // Set allowed tools
+    const hasActionsReadPermission =
+      context.inputs.additionalPermissions.get("actions") === "read" &&
+      context.isPR;
     const allAllowedTools = buildAllowedToolsString(
       context.inputs.allowedTools,
+      hasActionsReadPermission,
     );
     const allDisallowedTools = buildDisallowedToolsString(
       context.inputs.disallowedTools,

src/entrypoints/prepare.ts

@@ -94,6 +94,7 @@ async function run() {
       additionalMcpConfig,
       claudeCommentId: commentId.toString(),
       allowedTools: context.inputs.allowedTools,
+      context,
     });
     core.setOutput("mcp_config", mcpConfig);
   } catch (error) {

src/github/context.ts

@@ -37,6 +37,7 @@ export type ParsedGitHubContext = {
     baseBranch?: string;
     branchPrefix: string;
     useStickyComment: boolean;
+    additionalPermissions: Map<string, string>;
   };
 };
 
@@ -64,6 +65,9 @@ export function parseGitHubContext(): ParsedGitHubContext {
       baseBranch: process.env.BASE_BRANCH,
       branchPrefix: process.env.BRANCH_PREFIX ?? "claude/",
       useStickyComment: process.env.USE_STICKY_COMMENT === "true",
+      additionalPermissions: parseAdditionalPermissions(
+        process.env.ADDITIONAL_PERMISSIONS ?? "",
+      ),
     },
   };
 
@@ -125,6 +129,25 @@ export function parseMultilineInput(s: string): string[] {
     .filter((tool) => tool.length > 0);
 }
 
+export function parseAdditionalPermissions(s: string): Map<string, string> {
+  const permissions = new Map<string, string>();
+  if (!s || !s.trim()) {
+    return permissions;
+  }
+
+  const lines = s.trim().split("\n");
+  for (const line of lines) {
+    const trimmedLine = line.trim();
+    if (trimmedLine) {
+      const [key, value] = trimmedLine.split(":").map((part) => part.trim());
+      if (key && value) {
+        permissions.set(key, value);
+      }
+    }
+  }
+  return permissions;
+}
+
 export function isIssuesEvent(
   context: ParsedGitHubContext,
 ): context is ParsedGitHubContext & { payload: IssuesEvent } {

src/mcp/github-actions-server.ts

@@ -0,0 +1,275 @@
+#!/usr/bin/env node
+
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { z } from "zod";
+import { mkdir, writeFile } from "fs/promises";
+import { Octokit } from "@octokit/rest";
+
+const REPO_OWNER = process.env.REPO_OWNER;
+const REPO_NAME = process.env.REPO_NAME;
+const PR_NUMBER = process.env.PR_NUMBER;
+const GITHUB_TOKEN = process.env.GITHUB_TOKEN;
+const RUNNER_TEMP = process.env.RUNNER_TEMP || "/tmp";
+
+if (!REPO_OWNER || !REPO_NAME || !PR_NUMBER || !GITHUB_TOKEN) {
+  console.error(
+    "[GitHub CI Server] Error: REPO_OWNER, REPO_NAME, PR_NUMBER, and GITHUB_TOKEN environment variables are required",
+  );
+  process.exit(1);
+}
+
+const server = new McpServer({
+  name: "GitHub CI Server",
+  version: "0.0.1",
+});
+
+console.error("[GitHub CI Server] MCP Server instance created");
+
+server.tool(
+  "get_ci_status",
+  "Get CI status summary for this PR",
+  {
+    status: z
+      .enum([
+        "completed",
+        "action_required",
+        "cancelled",
+        "failure",
+        "neutral",
+        "skipped",
+        "stale",
+        "success",
+        "timed_out",
+        "in_progress",
+        "queued",
+        "requested",
+        "waiting",
+        "pending",
+      ])
+      .optional()
+      .describe("Filter workflow runs by status"),
+  },
+  async ({ status }) => {
+    try {
+      const client = new Octokit({
+        auth: GITHUB_TOKEN,
+      });
+
+      // Get the PR to find the head SHA
+      const { data: prData } = await client.pulls.get({
+        owner: REPO_OWNER!,
+        repo: REPO_NAME!,
+        pull_number: parseInt(PR_NUMBER!, 10),
+      });
+      const headSha = prData.head.sha;
+
+      const { data: runsData } = await client.actions.listWorkflowRunsForRepo({
+        owner: REPO_OWNER!,
+        repo: REPO_NAME!,
+        head_sha: headSha,
+        ...(status && { status }),
+      });
+
+      // Process runs to create summary
+      const runs = runsData.workflow_runs || [];
+      const summary = {
+        total_runs: runs.length,
+        failed: 0,
+        passed: 0,
+        pending: 0,
+      };
+
+      const processedRuns = runs.map((run: any) => {
+        // Update summary counts
+        if (run.status === "completed") {
+          if (run.conclusion === "success") {
+            summary.passed++;
+          } else if (run.conclusion === "failure") {
+            summary.failed++;
+          }
+        } else {
+          summary.pending++;
+        }
+
+        return {
+          id: run.id,
+          name: run.name,
+          status: run.status,
+          conclusion: run.conclusion,
+          html_url: run.html_url,
+          created_at: run.created_at,
+        };
+      });
+
+      const result = {
+        summary,
+        runs: processedRuns,
+      };
+
+      return {
+        content: [
+          {
+            type: "text",
+            text: JSON.stringify(result, null, 2),
+          },
+        ],
+      };
+    } catch (error) {
+      const errorMessage =
+        error instanceof Error ? error.message : String(error);
+      return {
+        content: [
+          {
+            type: "text",
+            text: `Error: ${errorMessage}`,
+          },
+        ],
+        error: errorMessage,
+        isError: true,
+      };
+    }
+  },
+);
+
+server.tool(
+  "get_workflow_run_details",
+  "Get job and step details for a workflow run",
+  {
+    run_id: z.number().describe("The workflow run ID"),
+  },
+  async ({ run_id }) => {
+    try {
+      const client = new Octokit({
+        auth: GITHUB_TOKEN,
+      });
+
+      // Get jobs for this workflow run
+      const { data: jobsData } = await client.actions.listJobsForWorkflowRun({
+        owner: REPO_OWNER!,
+        repo: REPO_NAME!,
+        run_id,
+      });
+
+      const processedJobs = jobsData.jobs.map((job: any) => {
+        // Extract failed steps
+        const failedSteps = (job.steps || [])
+          .filter((step: any) => step.conclusion === "failure")
+          .map((step: any) => ({
+            name: step.name,
+            number: step.number,
+          }));
+
+        return {
+          id: job.id,
+          name: job.name,
+          conclusion: job.conclusion,
+          html_url: job.html_url,
+          failed_steps: failedSteps,
+        };
+      });
+
+      const result = {
+        jobs: processedJobs,
+      };
+
+      return {
+        content: [
+          {
+            type: "text",
+            text: JSON.stringify(result, null, 2),
+          },
+        ],
+      };
+    } catch (error) {
+      const errorMessage =
+        error instanceof Error ? error.message : String(error);
+
+      return {
+        content: [
+          {
+            type: "text",
+            text: `Error: ${errorMessage}`,
+          },
+        ],
+        error: errorMessage,
+        isError: true,
+      };
+    }
+  },
+);
+
+server.tool(
+  "download_job_log",
+  "Download job logs to disk",
+  {
+    job_id: z.number().describe("The job ID"),
+  },
+  async ({ job_id }) => {
+    try {
+      const client = new Octokit({
+        auth: GITHUB_TOKEN,
+      });
+
+      const response = await client.actions.downloadJobLogsForWorkflowRun({
+        owner: REPO_OWNER!,
+        repo: REPO_NAME!,
+        job_id,
+      });
+
+      const logsText = response.data as unknown as string;
+
+      const logsDir = `${RUNNER_TEMP}/github-ci-logs`;
+      await mkdir(logsDir, { recursive: true });
+
+      const logPath = `${logsDir}/job-${job_id}.log`;
+      await writeFile(logPath, logsText, "utf-8");
+
+      const result = {
+        path: logPath,
+        size_bytes: Buffer.byteLength(logsText, "utf-8"),
+      };
+
+      return {
+        content: [
+          {
+            type: "text",
+            text: JSON.stringify(result, null, 2),
+          },
+        ],
+      };
+    } catch (error) {
+      const errorMessage =
+        error instanceof Error ? error.message : String(error);
+
+      return {
+        content: [
+          {
+            type: "text",
+            text: `Error: ${errorMessage}`,
+          },
+        ],
+        error: errorMessage,
+        isError: true,
+      };
+    }
+  },
+);
+
+async function runServer() {
+  try {
+    const transport = new StdioServerTransport();
+
+    await server.connect(transport);
+
+    process.on("exit", () => {
+      server.close();
+    });
+  } catch (error) {
+    throw error;
+  }
+}
+
+runServer().catch(() => {
+  process.exit(1);
+});

src/mcp/install-mcp-server.ts

@@ -1,5 +1,7 @@
 import * as core from "@actions/core";
 import { GITHUB_API_URL } from "../github/api/config";
+import type { ParsedGitHubContext } from "../github/context";
+import { Octokit } from "@octokit/rest";
 
 type PrepareConfigParams = {
   githubToken: string;
@@ -9,8 +11,41 @@ type PrepareConfigParams = {
   additionalMcpConfig?: string;
   claudeCommentId?: string;
   allowedTools: string[];
+  context: ParsedGitHubContext;
 };
 
+async function checkActionsReadPermission(
+  token: string,
+  owner: string,
+  repo: string,
+): Promise<boolean> {
+  try {
+    const client = new Octokit({ auth: token });
+
+    // Try to list workflow runs - this requires actions:read
+    // We use per_page=1 to minimize the response size
+    await client.actions.listWorkflowRunsForRepo({
+      owner,
+      repo,
+      per_page: 1,
+    });
+
+    return true;
+  } catch (error: any) {
+    // Check if it's a permission error
+    if (
+      error.status === 403 &&
+      error.message?.includes("Resource not accessible")
+    ) {
+      return false;
+    }
+
+    // For other errors (network issues, etc), log but don't fail
+    core.debug(`Failed to check actions permission: ${error.message}`);
+    return false;
+  }
+}
+
 export async function prepareMcpConfig(
   params: PrepareConfigParams,
 ): Promise<string> {
@@ -22,6 +57,7 @@ export async function prepareMcpConfig(
     additionalMcpConfig,
     claudeCommentId,
     allowedTools,
+    context,
   } = params;
   try {
     const allowedToolsList = allowedTools || [];
@@ -53,6 +89,42 @@ export async function prepareMcpConfig(
       },
     };
 
+    // Only add CI server if we have actions:read permission and we're in a PR context
+    const hasActionsReadPermission =
+      context.inputs.additionalPermissions.get("actions") === "read";
+
+    if (context.isPR && hasActionsReadPermission) {
+      // Verify the token actually has actions:read permission
+      const actuallyHasPermission = await checkActionsReadPermission(
+        process.env.ACTIONS_TOKEN || "",
+        owner,
+        repo,
+      );
+
+      if (!actuallyHasPermission) {
+        core.warning(
+          "The github_ci MCP server requires 'actions: read' permission. " +
+            "Please ensure your GitHub token has this permission. " +
+            "See: https://docs.github.com/en/actions/security-guides/automatic-token-authentication#permissions-for-the-github_token",
+        );
+      }
+      baseMcpConfig.mcpServers.github_ci = {
+        command: "bun",
+        args: [
+          "run",
+          `${process.env.GITHUB_ACTION_PATH}/src/mcp/github-actions-server.ts`,
+        ],
+        env: {
+          // Use workflow github token, not app token
+          GITHUB_TOKEN: process.env.ACTIONS_TOKEN,
+          REPO_OWNER: owner,
+          REPO_NAME: repo,
+          PR_NUMBER: context.entityNumber.toString(),
+          RUNNER_TEMP: process.env.RUNNER_TEMP || "/tmp",
+        },
+      };
+    }
+
     if (hasGitHubMcpTools) {
       baseMcpConfig.mcpServers.github = {
         command: "docker",